Mac is a brand of Apple products
Windows is the Microsoft Windows Operating system
Look into the HP series of laptops. I recommend one with the core I7 for power, 4GB ram, windows 7 64bit, and a 500GB drive. Since you're doing siting building you'll want a decent video card - anything with a 230, 240, or better will be fine.
you don't want a mac is most people don't have macs. You gotta think about your base viewers which most will be windows. It's easier in windows as well because of better application support.
opening a home care bus and will be using intuit site builder, quickbooks etc. Windows or Mac?